Difference between pages "Install/ru/Partitioning" and "Repository Configuration"

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(Undo revision 9202 by Duncan.britton (talk))
 
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<noinclude>
{{Warning|This article is a work-in-progress referring to a future Portage version. It does not apply to the current Funtoo Portage version. Please do not update your configuration yet.}}
{{InstallPart|процесс разбиения диска и создания файловых систем}}
</noinclude>
=== Подготовка жесткого диска ===


В этой части  мы научимся различным способам установки Funtoo Linux -- и загрузки с -- жесткий диск.
Starting with Portage-2.3.8, a switch to a new repository configuration framework is complete and users may want to update their configuration files. This document aims to describe the goals for the new framework and how to use it.


==== Введение ====
== Multiple repository layout ==
One of the most important changes is the switch from the old ''overlay'' layout to a new cleaner ''repository'' system. The new layout is more flexible and more predictable. For example, repositories can now use resources (eclasses, for example) provided by other repositories.


В прежние времена существовал лишь один способ загрузить PC-совместимый компьютер. Все наши дектопы и сервера имели стандартный PC BIOS, все наши харды использовали MBR и были разбиты используя схему разбивки MBR. Вот как это все было и нам это нравилось!
The old layout was based on the concept of one ''main tree'' and optionally a number of overlays. The main tree provided base system ebuilds, eclasses, profiles, while overlays mostly were able to provide their own ebuilds. The ebuild provided by overlays overrode the ebuilds in main tree to the extend of making it impossible to install the main tree version. Overlays could also provide eclasses for their own ebuilds and package.* entries that applied to all overlays and to the main tree. The Package Manager is responsible for updating the main tree, while overlays are managed externally.


Затем появились EFI и UEFI,  встроенные программы нового образца наряду со схемой разбивки GPT, поддерживающая диски размером более 2.2TБ. Неожиданно, нам стали доступны различные способы установки и загрузки Линукс систем . То, что было единым методом, стало чем-то более сложным.
The new layout is based on the concept of one or more configurable repositories. Each repository can either be stand-alone or depend upon other repositories. The distribution provides a repository called ''funtoo'' (a drop-in replacement for Gentoo's ''gentoo'' repository). Users can install more repositories at they will, the repositories providing their own ebuilds, eclasses and profiles as necessary and/or using them from other repositories. Users can explicitly choose the repository they want to install packages from. The Package Manager can update all repositories.


Let's take a moment to review the options available to you for configuring a hard drive to boot Funtoo Linux. This Install Guide uses, and recommends, the old-school method of BIOS booting and using an MBR. It works and (except for rare cases) is universally supported. There's nothing wrong with it. If your system disk is 2TB or smaller in size, it won't prevent you from using all of your disk's capacity, either.
== Portage configuration ==
=== New repository layout ===
The repository configuration should be stored in <code>/etc/portage/repos.conf</code>. It can be either a single file or a directory containing one or more ''.conf'' files.


But, there are some situations where the old-school method isn't optimal. If you have a system disk >2TB in size, then MBR partitions won't allow you to access all your storage. So that's one reason. Another reason is that there are some so-called "PC" systems out there that don't support BIOS booting anymore, and force you to use UEFI to boot. So, out of compassion for people who fall into this predicament, this Install Guide documents UEFI booting too.
The default configuration is installed as <code>/usr/share/portage/config/repos.conf</code>. This file is internal configuration file installed with portage ebuild and should '''not''' be modified. Instead, the configuration in <code>/etc/portage/repos.conf</code> can override the defaults specified there.


Our recommendation is still to go old-school unless you have reason not to. The boot loader we will be using to load the Linux kernel in this guide is called GRUB, so we call this method the '''BIOS + GRUB (MBR)''' method. It's the traditional method of setting up a PC-compatible system to boot Linux.
The configuration uses format similar to Windows .ini files. Each section heading (repository name in square brackets) signifies a single repository, followed by one or more key-value option pairs. For example, the following file copies default configuration for Funtoo repository:


If you need to use UEFI to boot, we recommend not using the MBR at all for booting, as some systems support this, but others don't. Instead, we recommend using UEFI to boot GRUB, which in turn will load Linux. We refer to this method as the '''UEFI + GRUB (GPT)''' method.
{{file|name=/etc/portage/repos.conf/funtoo.conf|desc=Example configuration override for Funtoo repository to move it to non-standard location|body=
[funtoo]
# moved to non-standard location!
location = /var/db/repos/funtoo
sync-type = git
sync-uri = git://github.com/funtoo/ports-2015.git
auto-sync = yes
}}


And yes, there are even more methods, some of which are documented on the [[Boot Methods]] page. We used to recommend a '''BIOS + GRUB (GPT)''' method but it is not consistently supported across a wide variety of hardware.
The most useful repository configuration options are listed below:
;location: ''Obligatory.'' Specifies the directory where repository is/will be stored. If Portage knows how to sync the repository and the location does not exist, it will be created on next ''emerge --sync''. Otherwise, the directory must exist.
;priority: Specifies the priority used for ordering ebuilds from different repositories. If two repositories provide an ebuild with matching versions, the repository with higher priority will be used.
;auto-sync: Specifies whether ''emerge --sync'' should update the repository. Defaults to ''yes'' if ''sync-type'' is specified, ''no'' otherwise.
;sync-depth: Specifies ''--depth'' for git clone. Used only on initial sync. Defaults to 1. Can be set to 0 to force full clone (not pass ''--depth'' at all).
;sync-type: Specifies syncing/update method. Can be one of: ''cvs'', ''git'', ''rsync'', ''svn''.
;sync-umask: Specifies the umask used when updating/syncing the repository.
;sync-uri: Specifies remote URI from which the repository will be cloned/synced. Can use any syntax valid for a particular syncing method.
;sync-user: Specifies the user[:group] used to update/sync the repository. If ''FEATURES=usersync'' is used, defaults to the credentials of directory owner.


'''The big question is -- which boot method should you use?''' Here's how to tell.
Additionally a <code>[DEFAULT]</code> section may be specified. Options in this section are used as defaults for all repositories.


;Principle 1 - Old School: If you can reliably boot System Rescue CD and it shows you an initial light blue menu, you are booting the CD using the BIOS, and it's likely that you can thus boot Funtoo Linux using the BIOS. So, go old-school and use BIOS booting, ''unless'' you have some reason to use UEFI, such as having a >2.2TB system disk. In that case, see Principle 2, as your system may also support UEFI booting.
=== Migrating existing configurations ===
The new configuration format provides replacement for existing configuration done through <code>/etc/portage/make.conf</code> and environment variables. While the variables are still supported for backwards compatibility, users are recommended to move to the new configuration scheme. Funtoo portage ebuild is planned to  make the migration unattended (repos.conf installed automatically to ease the config steps) with the following file:
{{file|name=/etc/portage/repos.conf/funtoo.conf|body=
[funtoo]
location = /usr/portage
sync-type = git
sync-uri = git://github.com/funtoo/ports-2015.git
auto-sync = yes
}}
The following replacements are provided for existing variables:
;PORTDIR: Used to specify main tree location. Replaced by ''location'' key in the section corresponding to the default repository (<code>[funtoo]</code> by default).
;PORTDIR_OVERLAY: Used to specify locations of overlays. Each of the paths needs to be replaced with a separate repository section, with the path placed in ''location'' key. Additionally, ''priority'' may be used to force specific ordering of ebuild overrides.
;SYNC: Used to specify URI for syncing the main repository, also implied a protocol for doing that. Replaced by the ''sync-uri'' and ''sync-type'' keys in the default repository section.
;SYNC_UMASK: Used to specify umask for syncing repositories. Replaced by ''sync-umask'' key in repository configuration. Can be specified in <code>[DEFAULT]</code> section to apply to all repositories.
;SYNC_USER: Used to specify user credentials for syncing repositories. Replaced by ''sync-user'' key in repository configuration. Can be specified in <code>[DEFAULT]</code> section to apply to all repositories.


;Principle 2 - New School: If you can reliably boot System Rescue CD and it shows you an initial black and white menu -- congratulations, your system is configured to support UEFI booting. This means that you are ready to install Funtoo Linux to boot via UEFI. Your system may still support BIOS booting, but just be trying UEFI first. You can poke around in your BIOS boot configuration and play with this.
{{file|name=/etc/portage/make.conf|desc=Example old make.conf file|body=
# user changed PORTDIR location
PORTDIR="/var/db/repos/funtoo"
PORTDIR_OVERLAY="/var/db/repos/foo /var/db/repos/bar"


;What's the Big Difference between Old School and New School?: Here's the deal. If you go with old-school MBR partitions, your <code>/boot</code> partition will be an ext2 filesystem, and you'll use <code>fdisk</code> to create your MBR partitions. If you go with new-school GPT partitions and UEFI booting, your <code>/boot</code> partition will be a vfat filesystem, because this is what UEFI is able to read, and you will use <code>gdisk</code> to create your GPT partitions. And you'll install GRUB a bit differently. That's about all it comes down to, in case you were curious.
SYNC="git://github.com/funtoo/ports-2015.git"
SYNC_USER="oleg"
SYNC_UMASK="022"
}}


;Also Note: To install Funtoo Linux to boot via the New School UEFI method, you must boot System Rescue CD using UEFI -- and see an initial black and white screen. Otherwise, UEFI will not be active and you will not be able to set it up!
{{file|name=/etc/portage/repos.conf|desc=Replacement repos.conf file|body=
[DEFAULT]
sync-user = oleg
sync-umask = 022


{{Note|'''Some motherboards may appear to support UEFI, but don't.''' Do your research. For example, the Award BIOS in my Gigabyte GA-990FXA-UD7 rev 1.1 has an option to enable UEFI boot for CD/DVD. '''This is not sufficient for enabling UEFI boot for hard drives and installing Funtoo Linux.''' UEFI must be supported for both removable media (so you can boot System Rescue CD using UEFI) as well as fixed media (so you can boot your new Funtoo Linux installation.) It turns out that later revisions of this board (rev 3.0) have a new BIOS that fully supports UEFI boot.  This may point to a third principle -- know thy hardware.}}
[funtoo]
location = /var/db/repos/funtoo
sync-type = git
sync-uri = git://github.com/funtoo/ports-2015.git


==== Old-School (BIOS/MBR) Method ====
[foo]
location = /var/db/repos/foo
priority = 1


{{Note|Use this method if you are booting using your BIOS, and if your System Rescue CD initial boot menu was light blue. If you're going to use the new-school method, [[#New-School (UEFI/GPT) Method|click here to jump down to UEFI/GPT.]]}}
[bar]
 
location = /var/db/repos/bar
===== Preparation =====
priority = 2
 
}}
First, it's a good idea to make sure that you've found the correct hard disk to partition. Try this command and verify that <code>/dev/sda</code> is the disk that you want to partition:
 
<console>
# ##i##fdisk -l /dev/sda
 
Disk /dev/sda: 640.1 GB, 640135028736 bytes, 1250263728 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: gpt
 
 
#        Start          End    Size  Type            Name
1        2048  1250263694  596.2G  Linux filesyste Linux filesystem
</console>
 
Now, it's recommended that you erase any existing MBR or GPT partition tables on the disk, which could confuse the system's BIOS at boot time. We do this using <code>sgdisk</code>:
{{fancywarning|This will make any existing partitions inaccessible! You are '''strongly''' cautioned and advised to backup any critical data before proceeding.}}
 
<console>
# ##i##sgdisk --zap-all /dev/sda
 
Creating new GPT entries.
GPT data structures destroyed! You may now partition the disk using fdisk or
other utilities.
</console>
 
This output is also nothing to worry about, as the command still succeded:
 
<console>
***************************************************************
Found invalid GPT and valid MBR; converting MBR to GPT format
in memory.
***************************************************************
</console>
 
===== Partitioning =====
 
Now we will use <code>fdisk</code> to create the MBR partition table and partitions:
 
<console>
# ##i##fdisk /dev/sda
</console>
 
Within <code>fdisk</code>, follow these steps:
 
'''Empty the partition table''':
 
<console>
Command (m for help): ##i##o ↵
</console>
 
'''Create Partition 1''' (boot):
 
<console>
Command (m for help): ##i##n ↵
Partition type (default p): ##i##↵
Partition number (1-4, default 1): ##i##↵
First sector: ##i##↵
Last sector: ##i##+128M ↵
</console>
 
'''Create Partition 2''' (swap):
 
<console>
Command (m for help): ##i##n ↵
Partition type (default p): ##i##↵
Partition number (2-4, default 2): ##i##↵
First sector: ##i##↵
Last sector: ##i##+2G ↵
Command (m for help): ##i##t ↵
Partition number (1,2, default 2): ##i## ↵
Hex code (type L to list all codes): ##i##82 ↵
</console>
 
'''Create the root partition:'''
 
<console>
Command (m for help): ##i##n ↵
Partition type (default p): ##i##↵
Partition number (3,4, default 3): ##i##↵
First sector: ##i##↵
Last sector: ##i##↵
</console>
 
'''Verify the partition table:'''
 
<console>
Command (m for help): ##i##p
 
Disk /dev/sda: 298.1 GiB, 320072933376 bytes, 625142448 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x82abc9a6
 
Device    Boot    Start      End    Blocks  Id System
/dev/sda1          2048    264191    131072  83 Linux
/dev/sda2        264192  4458495  2097152  82 Linux swap / Solaris
/dev/sda3        4458496 625142447 310341976  83 Linux
</console>
 
'''Write the parition table to disk:'''
 
<console>
Command (m for help): ##i##w
</console>
 
Your new MBR partition table will now be written to your system disk.
 
{{Note|You're done with partitioning! Now, jump over to [[#Creating filesystems|Creating filesystems]].}}
 
==== New-School (UEFI/GPT) Method ====
 
{{Note|Use this method if you are booting using UEFI, and if your System Rescue CD initial boot menu was black and white. If it was light blue, this method will not work.}}
 
The <tt>gdisk</tt> commands to create a GPT partition table are as follows. Adapt sizes as necessary, although these defaults will work for most users. Start <code>gdisk</code>:
 
<console>
# ##i##gdisk
</console>
 
Within <tt>gdisk</tt>, follow these steps:
 
'''Create a new empty partition table''' (This ''will'' erase all data on the disk when saved):
 
<console>
Command: ##i##o ↵
This option deletes all partitions and creates a new protective MBR.
Proceed? (Y/N): ##i##y ↵
</console>
 
'''Create Partition 1''' (boot):


<console>
The <code>repos.conf</code> configuration can be further extended with ''sync-type'' and ''sync-uri'' for overlays to get ''emerge --sync'' updating them automatically.
Command: ##i##n ↵
Partition Number: ##i##1 ↵
First sector: ##i##↵
Last sector: ##i##+500M ↵
Hex Code: ##i##↵
</console>


'''Create Partition 2''' (swap):
let's see a real example of tree and overlays added.
{{file|name=/etc/portage/repos.conf|desc=Replacement repos.conf file|body=


<console>
[gentoo]
Command: ##i##n ↵
location = /usr/portage
Partition Number: ##i##2 ↵
sync-type = git
First sector: ##i##↵
sync-uri = git://github.com/funtoo/ports-2012.git
Last sector: ##i##+4G ↵
Hex Code: ##i##8200 ↵
[funtoo-overlay]
</console>
location = /root/git/funtoo-overlay
 
'''Create Partition 3''' (root):
[funtoo-gnome]
 
location = /root/git/funtoo-gnome-overlay
<console>
Command: ##i##n ↵
Partition Number: ##i##3 ↵
First sector: ##i##↵
Last sector: ##i##↵##!i## (for rest of disk)
Hex Code: ##i##↵
</console>
 
Along the way, you can type "<tt>p</tt>" and hit Enter to view your current partition table. If you make a mistake, you can type "<tt>d</tt>" to delete an existing partition that you created. When you are satisfied with your partition setup, type "<tt>w</tt>" to write your configuration to disk:
 
'''Write Partition Table To Disk''':
 
<console>
Command: ##i##w ↵
Do you want to proceed? (Y/N): ##i##Y ↵
</console>
 
The partition table will now be written to disk and <tt>gdisk</tt> will close.
 
Now, your GPT/GUID partitions have been created, and will show up as the following ''block devices'' under Linux:
 
* <tt>/dev/sda1</tt>, which will be used to hold the <tt>/boot</tt> filesystem,
* <tt>/dev/sda2</tt>, which will be used for swap space, and
* <tt>/dev/sda3</tt>, which will hold your root filesystem.
 
==== Creating filesystems ====
 
{{Note|This section covers both BIOS ''and'' UEFI installs. Don't skip it!}}
 
Before your newly-created partitions can be used, the block devices need to be initialized with filesystem ''metadata''. This process is known as ''creating a filesystem'' on the block devices. After filesystems are created on the block devices, they can be mounted and used to store files.
 
Let's keep this simple. Are you using old-school MBR partitions? If so, let's create an ext2 filesystem on /dev/sda1:
 
<console>
# ##i##mkfs.ext2 /dev/sda1
</console>
 
If you're using new-school GPT partitions for UEFI, you'll want to create a vfat filesystem on /dev/sda1, because this is what UEFI is able to read:
 
<console>
# ##i##mkfs.vfat -F 32 /dev/sda1
</console>
 
Now, let's create a swap partition. This partition will be used as disk-based virtual memory for your Funtoo Linux system.
 
You will not create a filesystem on your swap partition, since it is not used to store files. But it is necessary to initialize it using the <code>mkswap</code> command. Then we'll run the <code>swapon</code> command to make your newly-initialized swap space immediately active within the live CD environment, in case it is needed during the rest of the install process:
 
<console>
# ##i##mkswap /dev/sda2
# ##i##swapon /dev/sda2
</console>
 
Now, we need to create a root filesystem. This is where Funtoo Linux will live. We generally recommend ext4 or XFS root filesystems. If you're not sure, choose ext4. Here's how to create a root ext4 filesystem:
 
<console>
# ##i##mkfs.ext4 /dev/sda3
</console>
 
...and here's how to create an XFS root filesystem, if you choose to use XFS:
 
<console>
# ##i##mkfs.xfs /dev/sda3
</console>
 
Your filesystems (and swap) have all now been initialized, so that that can be mounted (attached to your existing directory heirarchy) and used to store files. We are ready to begin installing Funtoo Linux on these brand-new filesystems.
 
{{fancywarning|1=
When deploying an OpenVZ host, please use ext4 exclusively. The Parallels development team tests extensively with ext4, and modern versions of <code>openvz-rhel6-stable</code> are '''not''' compatible with XFS, and you may experience kernel bugs.
}}
}}
 
funtoo-overlay and funtoo-gnome-overlay are an overlays added on top of regular portage tree.
==== Mounting filesystems ====
[[Category:Portage]]
 
Mount the newly-created filesystems as follows, creating <code>/mnt/funtoo</code> as the installation mount point:
 
<console>
# ##i##mkdir /mnt/funtoo
# ##i##mount /dev/sda3 /mnt/funtoo
# ##i##mkdir /mnt/funtoo/boot
# ##i##mount /dev/sda1 /mnt/funtoo/boot
</console>
 
Optionally, if you have a separate filesystem for <code>/home</code> or anything else:
 
<console>
# ##i##mkdir /mnt/funtoo/home
# ##i##mount /dev/sda4 /mnt/funtoo/home
</console>
 
If you have <code>/tmp</code> or <code>/var/tmp</code> on a separate filesystem, be sure to change the permissions of the mount point to be globally-writeable after mounting, as follows:
 
<console>
# ##i##chmod 1777 /mnt/funtoo/tmp
</console>

Revision as of 04:52, February 27, 2015

   Warning

This article is a work-in-progress referring to a future Portage version. It does not apply to the current Funtoo Portage version. Please do not update your configuration yet.

Starting with Portage-2.3.8, a switch to a new repository configuration framework is complete and users may want to update their configuration files. This document aims to describe the goals for the new framework and how to use it.

Multiple repository layout

One of the most important changes is the switch from the old overlay layout to a new cleaner repository system. The new layout is more flexible and more predictable. For example, repositories can now use resources (eclasses, for example) provided by other repositories.

The old layout was based on the concept of one main tree and optionally a number of overlays. The main tree provided base system ebuilds, eclasses, profiles, while overlays mostly were able to provide their own ebuilds. The ebuild provided by overlays overrode the ebuilds in main tree to the extend of making it impossible to install the main tree version. Overlays could also provide eclasses for their own ebuilds and package.* entries that applied to all overlays and to the main tree. The Package Manager is responsible for updating the main tree, while overlays are managed externally.

The new layout is based on the concept of one or more configurable repositories. Each repository can either be stand-alone or depend upon other repositories. The distribution provides a repository called funtoo (a drop-in replacement for Gentoo's gentoo repository). Users can install more repositories at they will, the repositories providing their own ebuilds, eclasses and profiles as necessary and/or using them from other repositories. Users can explicitly choose the repository they want to install packages from. The Package Manager can update all repositories.

Portage configuration

New repository layout

The repository configuration should be stored in /etc/portage/repos.conf. It can be either a single file or a directory containing one or more .conf files.

The default configuration is installed as /usr/share/portage/config/repos.conf. This file is internal configuration file installed with portage ebuild and should not be modified. Instead, the configuration in /etc/portage/repos.conf can override the defaults specified there.

The configuration uses format similar to Windows .ini files. Each section heading (repository name in square brackets) signifies a single repository, followed by one or more key-value option pairs. For example, the following file copies default configuration for Funtoo repository:

   /etc/portage/repos.conf/funtoo.conf - Example configuration override for Funtoo repository to move it to non-standard location
[funtoo]
# moved to non-standard location!
location = /var/db/repos/funtoo
sync-type = git
sync-uri = git://github.com/funtoo/ports-2015.git
auto-sync = yes

The most useful repository configuration options are listed below:

location
Obligatory. Specifies the directory where repository is/will be stored. If Portage knows how to sync the repository and the location does not exist, it will be created on next emerge --sync. Otherwise, the directory must exist.
priority
Specifies the priority used for ordering ebuilds from different repositories. If two repositories provide an ebuild with matching versions, the repository with higher priority will be used.
auto-sync
Specifies whether emerge --sync should update the repository. Defaults to yes if sync-type is specified, no otherwise.
sync-depth
Specifies --depth for git clone. Used only on initial sync. Defaults to 1. Can be set to 0 to force full clone (not pass --depth at all).
sync-type
Specifies syncing/update method. Can be one of: cvs, git, rsync, svn.
sync-umask
Specifies the umask used when updating/syncing the repository.
sync-uri
Specifies remote URI from which the repository will be cloned/synced. Can use any syntax valid for a particular syncing method.
sync-user
Specifies the user[:group] used to update/sync the repository. If FEATURES=usersync is used, defaults to the credentials of directory owner.

Additionally a [DEFAULT] section may be specified. Options in this section are used as defaults for all repositories.

Migrating existing configurations

The new configuration format provides replacement for existing configuration done through /etc/portage/make.conf and environment variables. While the variables are still supported for backwards compatibility, users are recommended to move to the new configuration scheme. Funtoo portage ebuild is planned to make the migration unattended (repos.conf installed automatically to ease the config steps) with the following file:

   /etc/portage/repos.conf/funtoo.conf 
[funtoo]
location = /usr/portage
sync-type = git
sync-uri = git://github.com/funtoo/ports-2015.git
auto-sync = yes

The following replacements are provided for existing variables:

PORTDIR
Used to specify main tree location. Replaced by location key in the section corresponding to the default repository ([funtoo] by default).
PORTDIR_OVERLAY
Used to specify locations of overlays. Each of the paths needs to be replaced with a separate repository section, with the path placed in location key. Additionally, priority may be used to force specific ordering of ebuild overrides.
SYNC
Used to specify URI for syncing the main repository, also implied a protocol for doing that. Replaced by the sync-uri and sync-type keys in the default repository section.
SYNC_UMASK
Used to specify umask for syncing repositories. Replaced by sync-umask key in repository configuration. Can be specified in [DEFAULT] section to apply to all repositories.
SYNC_USER
Used to specify user credentials for syncing repositories. Replaced by sync-user key in repository configuration. Can be specified in [DEFAULT] section to apply to all repositories.
   /etc/portage/make.conf - Example old make.conf file
# user changed PORTDIR location
PORTDIR="/var/db/repos/funtoo"
PORTDIR_OVERLAY="/var/db/repos/foo /var/db/repos/bar"

SYNC="git://github.com/funtoo/ports-2015.git"
SYNC_USER="oleg"
SYNC_UMASK="022"
   /etc/portage/repos.conf - Replacement repos.conf file
[DEFAULT]
sync-user = oleg
sync-umask = 022

[funtoo]
location = /var/db/repos/funtoo
sync-type = git
sync-uri = git://github.com/funtoo/ports-2015.git

[foo]
location = /var/db/repos/foo
priority = 1

[bar]
location = /var/db/repos/bar
priority = 2

The repos.conf configuration can be further extended with sync-type and sync-uri for overlays to get emerge --sync updating them automatically.

let's see a real example of tree and overlays added.

   /etc/portage/repos.conf - Replacement repos.conf file
[gentoo]
location = /usr/portage
sync-type = git
sync-uri = git://github.com/funtoo/ports-2012.git
 
[funtoo-overlay]
location = /root/git/funtoo-overlay
 
[funtoo-gnome]
location = /root/git/funtoo-gnome-overlay

funtoo-overlay and funtoo-gnome-overlay are an overlays added on top of regular portage tree.

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